define(function(require, exports, module) {

	var setCookie = function(name,value,hours,path){
	    var name = escape(name);
	    var value = escape(value);
	    var expires = new Date();
	    expires.setTime(expires.getTime() + hours*3600000);
	    path = path == "" ? "" : ";path=" + path;
	    _expires = (typeof hours) == "string" ? "" : ";expires=" + expires.toUTCString();
	    document.cookie = name + "=" + value + _expires + path;
	}
	//获取cookie值
	var getCookieValue = function(name){
	    var name = escape(name);
	    //读cookie属性，这将返回文档的所有cookie
	    var allcookies = document.cookie;       
	    //查找名为name的cookie的开始位置
	    name += "=";
	    var pos = allcookies.indexOf(name);    
	    //如果找到了具有该名字的cookie，那么提取并使用它的值
	    if (pos != -1){                                             //如果pos值为-1则说明搜索"version="失败
	        var start = pos + name.length;                  //cookie值开始的位置
	        var end = allcookies.indexOf(";",start);        //从cookie值开始的位置起搜索第一个";"的位置,即cookie值结尾的位置
	        if (end == -1) end = allcookies.length;        //如果end值为-1说明cookie列表里只有一个cookie
	        var value = allcookies.substring(start,end);  //提取cookie的值
	        return (value);                           //对它解码      
	        }   
	    else return "";                                             //搜索失败，返回空字符串
	}
	//删除cookie
	function deleteCookie(name,path){
	    var name = escape(name);
	    var expires = new Date(0);
	    path = path == "" ? "" : ";path=" + path;
	    document.cookie = name + "="+ ";expires=" + expires.toUTCString() + path;
	}
	
	module.exports = {
		setCookie: setCookie,
		getCookieValue: getCookieValue,
		deleteCookie: deleteCookie
	};

});